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IUPAC-NIST Solubility Database
NIST Standard Reference Database 106
Solubility System:
Acetonitrile with Water
Components:
(1) Water; H2O; [7732-18-5]
NIST Chemistry WebBook
for detail
(2) Acetonitrile; C2H3N; [75-05-8]
NIST Chemistry WebBook
for detail
Original Measurements:
Moolel, M.; Schneider, H., Z Phys. Chem. (Munich) 74, 237 (1971).
Variables:
Temperature = 259 K to 273 K
Prepared By:
Valerii P. Sazonov
Experimental Remarks:
UCST was reported at 272.9 K at x
1c
= 0.350 (100 w
1
= 55.1, compiler).
Experimental Data:
(Notes on the Nomenclature)
Mutual solubility of acetonitrile (1) and water (2)
t/°C
T/K
10
2
* Mass Fraction w
1
(compiler)
Mole Fraction x
1
Comment(s)
-14.7
258.5
-
-
Water-rich phase
-8.6
264.6
-
-
Water-rich phase
-6.8*
266.4
32.99
0.1777
Water-rich phase
-5.9
267.3
-
-
Water-rich phase
-4.4
268.8
36.92
0.2044
Water-rich phase
-4.1
269.1
-
-
Water-rich phase
-1.2
272.0
44.08
0.2571
Water-rich phase
-0.9
272.3
-
-
Water-rich phase
-0.3
272.9
54.21
0.3420
Water-rich phase
-14.7
258.5
85.52
0.7216
Acetonitrile-rich phase
-8.6
264.6
81.72
0.6625
Acetonitrile-rich phase
-6.8*
266.4
-
-
Acetonitrile-rich phase
-5.9
267.3
78.70
0.6186
Acetonitrile-rich phase
-4.4
268.8
-
-
Acetonitrile-rich phase
-4.1
269.1
75.86
0.5797
Acetonitrile-rich phase
-1.2
272.0
-
-
Acetonitrile-rich phase
-0.9
272.3
65.91
0.4591
Acetonitrile-rich phase
-0.3
272.9
-
-
Acetonitrile-rich phase
Method/Apparatus/Procedure:
The synthetic method was used. The solutions were prepared by weighing the components. Phase separation was followed optically by determining the temperature at which opalescence in a single phase or the disappearance of the phase boundary in a mixed phase occurred. This temperature was measured by means of a thermistor, which dipped into the experimental solution; about 4 mL in volume, kept stirred in a three-walled container and directly observed through a glass window. Through the inner mantle of the container, thermostated water was circulated; the outer mantle was evacuated to avoid condensation of atmospheric moisture on the observation window, as the temperature was lowered. The temperature variation was at the rate of about 0.2 °C·min
-1
.
Source and Purity of Materials:
(1) Fluka; puriss.; purity > 99.5 mole %; not purified.
(2) Twice distilled.
Estimated Errors:
Temperature: ± 0.1 K